Revisiting the electrochemical impedance behaviour of the LiFePO4/C cathode

Journal of Chemical Sciences

Jun Wu¹  Yanhui Xu2¹  Hua Ju² 

[1] Institute of Chemical Power Sources, Soochow University, Suzhou 215006, China$$;School of Urban Rail Transportation, Soochow University, Suzhou 215006, China$$

关键词: Lithium ion battery;    impedance spectroscopy;    electrochemistry;    lithium iron phosphate.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

In the present work, the electrochemical behaviour of LiFePO4/C electrode has been reported. Specially, the electrochemical impedance spectroscopies (EIS) have been studied in detail. The discharge capacity is more than 120 mAh/g. There are two semicircles being found in the Nyquist plot for the cycled electrode and one semicircle for the as-prepared electrode. It is found that the interface capacitance is in an order of magnitude of 10 𝜇F/cm2 for the high-frequency semicircle, while for the second semicircle the interface capacitance is 5.3 ∼ 45.4 × 103 𝜇F/cm2. It could be concluded that the high-frequency semicircle is to correspond to the charge transfer process. The function of the carbon layer is also briefly discussed.

【 授权许可】

Unknown